Inside a sports arena in Sinaloa state’s capital, the crowd was sparse early on the card as young amateur boxers in puffy headgear threw punches and danced about the ring. Outside stood a bronze statue of Julio César Chávez in boxing trunks, one glove raised. Chávez’s eldest son, Julio César Chávez Jr., was arrested by U.S. immigration agents outside his home in Los Angeles on Wednesday, accused of overstaying his visa and lying on a green card application.